I think you're being a bit unfair, or, at very least one sided, the males have an equal amount of relationship issues too:
John-Boy: Promises Jenny not to see anybody else and breaks the promise, possibly even just a few episodes later with Sarah Jane, depending on how you look at their relationship. He makes and breaks the same promise with Marcia Woolery. You could also accuse him of leading her on too, if you wanted. He also almost abandoned his whole family for Madeline Bennett. When he went to England, he still loved Daisy, then he just stopped writing to her and Daisy said she knew it was over, why is that? Did he meet somebody else?
Zebulon: Often acts flirtatiously with other women to make Esther jealous when he's annoyed with her.
Jim-Bob: Possibly had an unprotected one night stand with a girl, then abandoned her. That's a bit ambigouous though. According to Corabeth he's a bit of womaniser, wooing lots of girls with his car and driving them up on the mountain, letting them think they're special, then he'll just be with somebody else the next night, he agrees with her too.
Ike: Had an affair while married to Corabeth. Though whether it was an emotional or physical affair for you to decide.
Ben: Dated a girl just to annoy Jim-Bob and to make another girl jealous. He shouldn't be playing with people's emotions like that. When he married Cindy, he said to John it was so they 'wouldn't get carried away' so, he married her just for sex? Oh dear. He wasn't very nice at all to Cindy when they first got married either.
Jason: Very short tempered with Toni, even though she's only doing her job.
I can't think of anything about John though, he's a lovely man. But still, yes, as you can see, the girls are no worse than the men, and none of them are especially bad.